title: Spectra of photoneutrons produced by high-energy X-ray radiotherapy linacs.
abstract: Spectral fluence of photoneutrons generated in the head of the radiotherapeutic linac Varian 2100 C/D was measured by means of the Bonner spheres spectrometer whose active detector of thermal neutrons was replaced by a track detector, i.e. a sandwich of four CR-39s with the boron radiator inserted between them. Measurements with different collimator settings showed that the fluence of photoneutrons was higher for the more open collimator.
authors.affiliation: Inspectorate for Ionizing Radiation, Czech Metrology Institute, Radiová 1, CZ 102 00 Prague 10, Czech Republic. mkralik@cmi.cz
authors.forename: M
authors.initials: M
authors.lastname: Králík
authors.forename: K
authors.initials: K
authors.lastname: Turek
authors.forename: V
authors.initials: V
authors.lastname: Vondrácek
mesh_terms: D000465:Algorithms; D006801:Humans; D009502:Neutrons; D010315:Particle Accelerators; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods; D011882:Radiotherapy, High-Energy / Q000295:instrumentation* / Q000379:methods; D013053:Spectrophotometry; D014965:X-Rays